1161. Free energy change for a reversible process is :
A. > 0
B. < 0
C. Equal to zero *
D. Unpredictable
1162. The intensity expected to raise the temperature of a body by 1 K is called :
A. Specific heat
B. Thermal capacity *
C. Water equivalent
D. None of these
1163. An adiabatic expansion of an ideal gas always has :
A. Decrease in temperature
B. Q = 0 *
C. W = 0
D. H = 0
1164. C (Diamond) C (Graphite) H = -ve. This show that:
A. Graphite is more steady than jewel *
B. Graphite has more energy than diamond
C. Both are equally stable
D. Stability cannot be predicted
1165. Mechanical work is especially important in systems that contain :
A. Solid – Liquid
B. Liquid – Liquid
C. Solid – Solid
D. Gases *
1166. The process of exchanging heat in a chemical reaction under constant pressure and temperature is known as:
A. Entropy change
B. Enthalpy change *
C. Internal energy change
D. Free energy change
1167. Water has a molar heat capacity of 75 JK-1 mol-1 at constant pressure, or cp. When 1.0 kJ of intensity is provided to 100 g of water which is allowed to extend, the expansion in temperature of water is :
A. 6.6 K
B. 1.2 K
C. 2.4 K *
D. 4.8 K
1168. What is the entropy change ( in JK-1 MOL-1) when one mole of ice is changed over into water at 0 degree centigrade ?( At 0 degrees Celsius, the enthalpy change required to transform ice into liquid water is 6.0 kJ mol-1.)
A. 21.98 *
B. 20.13
C. 2.013
D. 2.198
1169. When a system transitions from state A to state B, the internal energy change is 40 kJ/mole. What would be the total change in internal energy if the system traveled from state A to state B in a reversible manner and then returned to state A in an irreversible manner?
A. 40 kJ
B. > 40 kJ
C. < 40 kJ
D. Zero *
1170. Enthalpy of formation of HF and HCI are -161 kJ and -92 kJ respectively . Which ofthe following statements is incorrect ?
A. Fluorine has a greater affinity for hydrogen than chlorine does for hydrogen.
B. HF is more stable than HCI
C. HCI is more stable than HF
D. HF and HCI are endothermic compounds *